Well the zoo is an island, so the river splits in two and reconnects itself after the zoo, just west of the weir. The north side of the island is much smaller and calmer.
I would say there is ample warning of the weir. Signage everywhere. And usually there is the boom that spans the width of the river, but apparently it got washed out last week. The river has been too swift and high for them to replace it yet. This according to the Herald article this morning. That makes sense.
Doesn't take away from the fact that if you're going on a river swelled by springtime run-off and rain, you should be prepared and understand what you're going to encounter.
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